TaskHost.exe' has exited with code -2147220717 (0x80040313)

I've Navigate to next page and then Navigate back in windows phone 8, If 5 or 6 times i do this app is crashed and output windows shows "TaskHost.exe has exited with code -2147220717 (0x80040313)". I don't know why this is happening. If anybody knows please suggest me. It is very argent.

//////////////// MainPage /////////////////

    protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            base.OnNavigatedFrom(e);

        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {

            base.OnNavigatedTo(e);
            App app=App.Current as App;
            if (app.IsFromFavouritePage)
            {
                    ShowStoryboard.Begin();
                    app.IsFromFavouritePage = false;
                    MainViewModel mvm = DataContext as MainViewModel;
                    mvm.RingtoneCollection.Clear();
                    mvm.RingtoneCollection = CheckFavouriteRingtone(app.CollectionOfRingtone, app.CollectionOfRingtone[0].category_ringtone_id.ToString());
                    ApplicationBar.IsVisible = true;

            }

        }

    private void favListButton_Click(object sender, RoutedEventArgs e)
        {
            MainViewModel mvm = DataContext as MainViewModel;
            App app = App.Current as App;
            app.CollectionOfRingtone.Clear();
            foreach (RingtoneClass aRingtone in mvm.RingtoneCollection)
            {
                app.CollectionOfRingtone.Add(aRingtone);
            }
            List<RingtoneClass> listOfFavouriteRingtone = SelectAllFromDb();
            if (listOfFavouriteRingtone != null && listOfFavouriteRingtone.Count > 0)
            {
                app.IsPopular = IsPopular;
                NavigationService.Navigate(new Uri("/FavouritePage.xaml", UriKind.Relative));
            }

        }

///////////////// NEXT PAGE (FavouritePage) ///////////////////////////////////////////

private void backImageButton_Tap(object sender, System.Windows.Input.GestureEventArgs e)
        {
            app = App.Current as App;
            app.IsFromFavouritePage = true;
            NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));         
        }

        protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
        {
            base.OnBackKeyPress(e);
            app = App.Current as App;
            app.IsFromFavouritePage = true;
            NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));

        }

//////////////////// OUTPUT FROM DEBUG ///////////// 'TaskHost.exe' (Win32): Loaded '\Device\HarddiskVolume27\Windows\System32\WebBrowserControlRes.dll'. Module was built without symbols. 'TaskHost.exe' (Win32): Unloaded '\Device\HarddiskVolume27\Windows\System32\WebBrowserControlRes.dll' 'TaskHost.exe' (Win32): Loaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll'. Module was built without symbols. 'TaskHost.exe' (Win32): Unloaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll' 'TaskHost.exe' (Win32): Loaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll'. Module was built without symbols. 'TaskHost.exe' (Win32): Unloaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll' 'TaskHost.exe' (Win32): Loaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll'. Module was built without symbols. 'TaskHost.exe' (Win32): Unloaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll' 'TaskHost.exe' (Win32): Loaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll'. Module was built without symbols. 'TaskHost.exe' (Win32): Unloaded '\Device\HarddiskVolume27\Windows\System32\UIXMobileAssets480x800.dll' First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: LegacyHelper::ApiException at memory location 0x0C57F658. First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: LegacyHelper::ApiException at memory location 0x0C57F230. First-chance exception at 0x76FC1EDB (KERNELBASE.DLL) in TaskHost.exe: 0xE0434352 (parameters: 0x80131501, 0x00000000, 0x00000000, 0x00000000, 0x70150000). The thread 0xe34 has exited with code 0 (0x0). First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: Js::JavascriptExceptionObject at memory location 0x0C57D7A8. First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: Js::JavascriptExceptionObject at memory location 0x0C57D498. First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: Js::JavascriptExceptionObject at memory location 0x0C57D188. First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: Js::JavascriptExceptionObject at memory location 0x0C57DAD0. First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: Js::JavascriptExceptionObject at memory location 0x0C57EBF8. First-chance exception at 0x76FC1EDB in TaskHost.exe: Microsoft C++ exception: LegacyHelper::ApiException at memory location 0x0C57DF08. The thread 0xe08 has exited with code -2147220717 (0x80040313). The thread 0x7b0 has exited with code -2147220717 (0x80040313). The thread 0xf18 has exited with code -2147220717 (0x80040313). The thread 0x424 has exited with code -2147220717 (0x80040313). The thread 0x2a8 has exited with code -2147220717 (0x80040313). The thread 0x960 has exited with code -2147220717 (0x80040313). The thread 0xab4 has exited with code -2147220717 (0x80040313). The thread 0xdc has exited with code -2147220717 (0x80040313). The thread 0x200 has exited with code -2147220717 (0x80040313). The thread 0xe78 has exited with code -2147220717 (0x80040313). The thread 0xf4c has exited with code -2147220717 (0x80040313). The thread 0xf68 has exited with code -2147220717 (0x80040313). The thread 0x6a8 has exited with code -2147220717 (0x80040313). The thread 0xf34 has exited with code -2147220717 (0x80040313). The thread 0x294 has exited with code -2147220717 (0x80040313). The thread 0xb50 has exited with code -2147220717 (0x80040313). The thread 0xf54 has exited with code -2147220717 (0x80040313). The thread 0x838 has exited with code -2147220717 (0x80040313). The thread 0xea8 has exited with code -2147220717 (0x80040313). The thread 0x7dc has exited with code -2147220717 (0x80040313). The thread 0xb30 has exited with code -2147220717 (0x80040313). The thread 0x10c has exited with code -2147220717 (0x80040313). The thread 0x40c has exited with code -2147220717 (0x80040313). The thread 0xd44 has exited with code -2147220717 (0x80040313). The thread 0x658 has exited with code -2147220717 (0x80040313). The thread 0x210 has exited with code -2147220717 (0x80040313). The thread 0xc64 has exited with code -2147220717 (0x80040313). The thread 0xbc4 has exited with code -2147220717 (0x80040313). The thread 0xf58 has exited with code -2147220717 (0x80040313). The thread 0xd68 has exited with code -2147220717 (0x80040313). The thread 0xdc4 has exited with code -2147220717 (0x80040313). The thread 0x9ac has exited with code -2147220717 (0x80040313). The thread 0x378 has exited with code -2147220717 (0x80040313). The thread 0x618 has exited with code -2147220717 (0x80040313). The thread 0x434 has exited with code -2147220717 (0x80040313). The thread 0x78 has exited with code -2147220717 (0x80040313). The thread 0xef8 has exited with code -2147220717 (0x80040313). The thread 0xf5c has exited with code -2147220717 (0x80040313). The thread 0x880 has exited with code -2147220717 (0x80040313). The thread 0x958 has exited with code -2147220717 (0x80040313). The thread 0x898 has exited with code -2147220717 (0x80040313). The thread 0xbd8 has exited with code -2147220717 (0x80040313). The thread 0x978 has exited with code -2147220717 (0x80040313). The thread 0xc8c has exited with code -2147220717 (0x80040313). The thread 0xd54 has exited with code -2147220717 (0x80040313). The thread 0xc68 has exited with code -2147220717 (0x80040313). The thread 0xcf4 has exited with code -2147220717 (0x80040313). The thread 0xfb4 has exited with code -2147220717 (0x80040313). The thread 0xc7c has exited with code -2147220717 (0x80040313). The thread 0x2b4 has exited with code -2147220717 (0x80040313). The thread 0xf94 has exited with code -2147220717 (0x80040313). The thread 0x30 has exited with code -2147220717 (0x80040313). The thread 0xf84 has exited with code -2147220717 (0x80040313). The thread 0xa54 has exited with code -2147220717 (0x80040313). The thread 0x820 has exited with code -2147220717 (0x80040313). The thread 0x92c has exited with code -2147220717 (0x80040313). The thread 0x1a8 has exited with code -2147220717 (0x80040313). The thread 0xe0c has exited with code -2147220717 (0x80040313). The thread 0xd28 has exited with code -2147220717 (0x80040313). The thread 0xa00 has exited with code -2147220717 (0x80040313). The thread 0xf38 has exited with code -2147220717 (0x80040313). The thread 0xd70 has exited with code -2147220717 (0x80040313). The thread 0xdd4 has exited with code -2147220717 (0x80040313). The thread 0xf50 has exited with code -2147220717 (0x80040313). The thread 0x9cc has exited with code -2147220717 (0x80040313). The thread 0xb0c has exited with code -2147220717 (0x80040313). The thread 0x3e4 has exited with code -2147220717 (0x80040313). The thread 0x8c has exited with code -2147220717 (0x80040313). The thread 0xcc8 has exited with code -2147220717 (0x80040313). The thread 0x848 has exited with code -2147220717 (0x80040313). The thread 0xb04 has exited with code -2147220717 (0x80040313). The thread 0xf90 has exited with code -2147220717 (0x80040313). The thread 0xe6c has exited with code -2147220717 (0x80040313). The program '[3700] TaskHost.exe' has exited with code -2147220717 (0x80040313).